Lathe chuck



May 21, 1929.' E. wHn-ON 1,713,799

LATHE CHUCK *Fi1ed March 22, 1926 s sheets-sheet l gigiA 55 INVENTOR L. EL WHITON LATHE CHUCK Filed March 22, 1926 I5 Sheets-Sheet 2 I May 2l, 1929.

L.. E. wHlToN LATHE CHUCK Filed March 22, 1926 3 Sheets-Sheet 3 Patented May 21, 1929.

Lucius n. vvnlajon, on 'new nounou, 'connncrron'n LATER CHUCK.

application mee March a2, 192e. serial nonsense.

My invention relates particularly to what are sometimes termed automatic chucks which can be adjusted tor gripping or releasing the stock While it is rotating.

One object is to provide a construction of this character which grips the stock firmly and'positively Without any backlash or play in the parts. y

Another obj ect is to provide for convenient adjustments by a handflever or alternately by a Wrench, irrespective of Whether the chuck body is revolving or stationary.

Afnother object is to provide-.a construction which can be adjusted so as to bring the control mechanism into position convenient for the operator.

Another object is to provide a compact, powerful.construction of this cliaractertlie parts of which are so arranged as to permit the stock or Vback-facing tools to Abe fed through the lathe spindle Without obstruc tion. i

In carrying out the invention I utilize certain principles Which are broadly claimed in my former applications Nos. 61.?173 :tiled Oct. 8, 1925 and 77,983 tiled Dec. 9.8, 1925. lIn the present constructiomhowever, the` scroll plate is .split radially so as to beresiliently expansible andr contractible, and provided with Wedgelike teeth so that it automatical- 1 ly takes up any `play between the `adjacent parts. The adjusting niernber for controlling relative movements of the planetary members is provided with sockets for an .operating lever and also provided with an adjusting operator, the position ot' Whichis adjustable circumierentially` to bring itto a convenient position. Details of the preferred Construction and arrangements will be under stood from the accompanyingthree sheets of drawings. l l Y Fig. lisa longitudinal scctioniand sideele vat-ion of a chuck involving my present invention and showing a part of the lathe spindle.

Fig. 2 is a side view ot the mechanism showing in dot-andda`sh lines a fragment of the head stock serving as an anchorage. y e Y Fig.` 3 is `a front 'View of one-halt of the scroll' plate. Y .i

Fig. 4; isa view-of the chuck from the rear, seine parts being broken and other parts being shown in section for illustrative purpose. l

The chuck body may bel-of any suitable inaterialwvith acentral part orhub 7 and an outer rini or flange 8. The scroll plate 9 is mounted fivithinthe body between the outer Wall of thehub 7 and the inner Wall of the iiange 8. j The body is provided with anuinber of radial-slots 10 for the j aWs or jawbases 11. Forconvenicnce in manufacture and assenibly,the vhub is 4formed of two parts, ,the rearqpart 12 being secured to the front part 7 by a nuniber of screws 13. preferably threader internally to iit the thread end ot the spindle 14. `and thespindle is provided With a shoulder lagainst which a part oi' the hublQ fits when the `parts are `properly assenibled 4 On `the hub ismounted a sleeve orfring` 16 having teethuvhich extend.outwardly.v A gear ring 1T has teeth facing toward the teeth A of the gear 16. This gear ring 17 is secured to the scroll plate` 9 so as to rotate with it. Forconvenience in manufacture and assembly the connection between 17 and 9 is eifected by clutchV teeth 18. .Between the `gears 16 and 17,1 mount series of pinions 19. Alongside ofthe gear 16 and on its hubl mount a gearring 2O having teeth theteeth on 16. ,A gear ring Qlcorresponding to, gear ring 17 `secnredto the flange of the correspondinggto The `hub 7i is i body of the chuck by screws 2.2. Between gears 20 andQl is `mounted a series of pinions 23ccrrespondin with the pinions 19, and

in fact having coinrnon shafts orstudsi` on which they `can relatively rotate. A `disc or platelivhiehis normally stationary or fixed, servesjasone guide Wall, for these pairs of pinions andtheir studs or shafts,while the scroll plate @serves as the other guidevvallf, The gear ring 2O is keyed or otherwise suitably securedl tothe disc 2.5.y These parts are so constructed and arranged t'hatno` additional spider orsupport is required for the shaft 24.

Thehead stock 26 orlitraineof the `lathe carries a'stud 27. Anotherstud 2S is secured to the .disc 25 and-the tivov studs are connected byfa. link 29 so that theposition off the disc 25 is norniaiilly fixed by the location ot the stud 27 in the headistoclrof the machine.

y The adjusting disc SOgis keyedtothe hub of the gear 16` and rotatable againstone face of the stationarywdisc 25. This adjusting disc 30 is provided Withfia series of recesses 31 adapted to` receive `the inner end of a, hand leverBQ so as to facilitate the rotation of the adjusting disc` by hand. The bevel gear 33 is secured to the disc 130 by screws 3a so that the bevel gear isa `partei the adjusting member.. A bevel pinion `35 meshing With the gear 33, has bushings `36 and 37 in the housing 38. ,'l'lhis housinghasan extension arm 39 able jaws, means for adjusting said jaws While said body is in motion, said means including a split and resiliently expansible scroll plate, a bevel gear, and a bevel pinion meshing therewith, means guided by said gear for supporting said pinion, and means for rotating said scroll plate with respect to the chuck body upon rotation of the bevel pinion.

LA chuck comprising a body, jaws adjustable therein, means tor adjusting said jaws while the body in motion, including a split and resiliently eapansible scroll plate, an adj listing member having means tor rotating it, a planetary train between said adjusting member and said plate, and reducing gear mechanism connected to said adjusting member. Y

5. A chuck comprising a body, jaws guided therein, a split and resiliently expansible and contractible scroll plate for adjusting said jaws, two discs, a j )lanetary gear train connected between said.body and said scroll plate on the one side and said discs on the other side, means for supporting one of said discs in a lixed position, planetary means for rotating the other disc at will while the lirst disc is stationary, and an adjustable support ior part of said means for rotating said disc.

6. A chuck body having a hub, a slotted face and a liange, jaws in said tace, a split and resiliently expansible scroll plate fitted on said hub within said flange behind said tace and having a wedge-like thread engaging corresponding grooves and teeth in said jaws, and means for rotating said scroll plate in said body.

7. A chuck comprising a stationary plate,

an adjusting member, a body having guideways with jaws movable the-rein, a split and resiliently expansible scroll plate mounted in the body and having a wedging thread engaging corresponding teeth on the jaws, and a planetary gear train connecting said body and scroll plate wit-l1 said stationair f plate and adjusting member, and including pairs of coaxially mounted pinions traveling between said scroll plate and said stationary plate.

8. A chuck comprising a body with adjustable jaws, means for adjusting said jaws while said body in motion, said means including a gear member and a pinion meshing therewith, a housing for supporting said pinion, said gear member having a circumferential groove and arc-shaped segments scoured to said housing and guided .in said groove in said gear member.

9. A chuck comprising a body, a series of jaws movable therein, a rotatable operator connected to the other spur gear, a driving pinion for sait` rotatable gear and a bearing i'or said driving pinion secured to said sta-- tionarymember.

l0. In a chuck, a body having radially movable jaws, a' split and resiliently expansible scroll plate having a spiral thread whose sides are inclined and in mesh with the jaws and a differential planetary gear train connecting the body and scroll plate for giving a relative rotation of the scroll plate in the body while the body is rotating.

ll. A chuck comprising a body, a series of radially movable jaws guided therein, a rz dially split and resiliently expansible scroll plate having a wedge-like spiral thread engaging said jaws, annular gear rings connected respectively to the chuck body and to said scroll plate, spur gears mounted concentrically with said gear rings, two discs mounted side by side and connected respectively to said spur gears, a series ot pairs of planetary pinions meshing with said gear rings and said spur gears and guided between said scroll plate and one` of said discs, one of said discs being relatively stationary and reduction drive mechanism for rotating the other disc.

12. A chuck comprising a body, radially movable jaws mounted therein, a ianged gear member secured to said body and providing a bearing surface, two spurgears one oi' which is supported on saidV bearing surt'ace, a member for normally holding the other' gear relatively stationary, an adjusting member connected to the first mentioned gear, a bevelled gear secured to said adjusting member, a housing mounted upon and supported by said adjusting member, a bevelled pinion carried by said housing and meshing with said bevelled wear, said housing being circumferentially adjustableA on said adjusting member, annular' gear rings mounted concentrically with said spur gears,

a series ot pairs of planetary pinions mounted to travel between said gear rings and said spur gears, means tor securing one of said gear rings to the chuck body andV a jaw adjusting member connected to the other gear ring.

. LUCIUS E. WHTON. 

